/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.room.writer

import androidx.room.compiler.codegen.VisibilityModifier
import androidx.room.compiler.codegen.XFunSpec
import androidx.room.compiler.codegen.XFunSpec.Builder.Companion.addStatement
import androidx.room.compiler.codegen.XTypeName
import androidx.room.compiler.codegen.XTypeSpec
import androidx.room.ext.CommonTypeNames
import androidx.room.ext.RoomTypeNames
import androidx.room.ext.SQLiteDriverTypeNames
import androidx.room.ext.SupportDbTypeNames
import androidx.room.solver.CodeGenScope
import androidx.room.vo.FieldWithIndex
import androidx.room.vo.Fields
import androidx.room.vo.ShortcutEntity

class EntityDeleteAdapterWriter
private constructor(val tableName: String, val pojoTypeName: XTypeName, val fields: Fields) {
    companion object {
        fun create(entity: ShortcutEntity): EntityDeleteAdapterWriter {
            val fieldsToUse =
                if (entity.isPartialEntity) {
                    // When using partial entity, delete by values in pojo
                    entity.pojo.fields
                } else {
                    // When using entity, delete by primary key
                    entity.primaryKey.fields
                }
            return EntityDeleteAdapterWriter(
                tableName = entity.tableName,
                pojoTypeName = entity.pojo.typeName,
                fields = fieldsToUse
            )
        }
    }

    fun createAnonymous(typeWriter: TypeWriter, dbParam: String, useDriverApi: Boolean): XTypeSpec {
        return if (useDriverApi) {
                XTypeSpec.anonymousClassBuilder(typeWriter.codeLanguage)
            } else {
                XTypeSpec.anonymousClassBuilder(typeWriter.codeLanguage, "%L", dbParam)
            }
            .apply {
                superclass(
                    if (useDriverApi) {
                            RoomTypeNames.DELETE_OR_UPDATE_ADAPTER
                        } else {
                            RoomTypeNames.DELETE_OR_UPDATE_ADAPTER_COMPAT
                        }
                        .parametrizedBy(pojoTypeName)
                )
                addFunction(
                    XFunSpec.builder(
                            language = language,
                            name = "createQuery",
                            visibility = VisibilityModifier.PROTECTED,
                            isOverride = true
                        )
                        .apply {
                            returns(CommonTypeNames.STRING)
                            val query =
                                "DELETE FROM `$tableName` WHERE " +
                                    fields.columnNames.joinToString(" AND ") { "`$it` = ?" }
                            addStatement("return %S", query)
                        }
                        .build()
                )
                addFunction(
                    XFunSpec.builder(
                            language = language,
                            name = "bind",
                            visibility = VisibilityModifier.PROTECTED,
                            isOverride = true
                        )
                        .apply {
                            val stmtParam = "statement"
                            addParameter(
                                if (useDriverApi) {
                                    SQLiteDriverTypeNames.STATEMENT
                                } else {
                                    SupportDbTypeNames.SQLITE_STMT
                                },
                                stmtParam
                            )
                            val entityParam = "entity"
                            addParameter(pojoTypeName, entityParam)
                            val mapped = FieldWithIndex.byOrder(fields)
                            val bindScope =
                                CodeGenScope(writer = typeWriter, useDriverApi = useDriverApi)
                            FieldReadWriteWriter.bindToStatement(
                                ownerVar = entityParam,
                                stmtParamVar = stmtParam,
                                fieldsWithIndices = mapped,
                                scope = bindScope
                            )
                            addCode(bindScope.generate())
                        }
                        .build()
                )
            }
            .build()
    }
}
